Remove tolerance form SkClassifyCubic

It's too inexact as-is. If the caller wants tolerance they can do
their own with knowledge of the pixel grid. The homogeneous math
is stable with infinities so it's really unnecessary here.

Bug: skia:7073
Change-Id: I4dc34ad96b859a138714b6d4f8804fec4f89f17a
Reviewed-on: https://skia-review.googlesource.com/51182
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
4 files changed